Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d68681eb509bc50…

MALICIOUS

PDF

97.5 KB Created: 2021-08-06 17:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d810f6b9f89be87f1342f773852c167 SHA-1: f6c0e5a1739f064c7a0c83a06a727c3e99c592ad SHA-256: 2d68681eb509bc5035b1b56eab2213d4c5c8fe4fa948ca2f7feceef11390fda8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to leverage SEO or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://beijingxinzhi.com/userfiles/file/20210608132111_1174464030.pdf In PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/zowopaboviriziri.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/6fnj9nvbf73o9tvlq1udar4s79/82352966877.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/pediwibujuwuko.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/givafasibosalededitowuj.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84d3a0fe4---gedazogoronatosinonunur.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210727053145_3xkb56.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f76334da7---55256936709.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c1bc61f6---felazudujenisepo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/zugidiraxuxelafuke.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/20498001044.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/66124240639.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/wirezofebukapasagasedog.pdfIn PDF document text
    • http://halmar.info/userfiles/file/4855937075.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075e54504---55264916408.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4267cb292---41454644740.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609025a024856---13035573687.pdfIn PDF document text
    • http://primaneighbors.com/userimages/12069679704.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/tukiwavejidovedemazijadi.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/zagixan.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/waxugofobasobibufivivim.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c78744b8930---famumawazokaxurujeguxosol.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/d84ebc7d09db272369360a630f4bf955/zurekapakuser.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ae2943dc---sakarap.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/rejojovifanogodepabi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27cfa27842---55968136385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+activated+charcoal+with+lemon+juicePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 10932 bytes
SHA-256: ebd610f19e45cd4f73f8aa09a34d0d48848fbe6d32532e637b8ead9cf7be685f
font_01_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 17228 bytes
SHA-256: 218acc482e3eab1f0cb3e4b38111dd75429fa748e728934f96c9054949bd6734
font_03_sfnt_off00015e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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